Great imagery and action. The tenses change a few times from present to past or past to present, so it is a little confusing as to what is happening now vs. what happened previously.
"Blood is being splattered" can just be "blood splatters." It isn't wrong the other way, but it comes off as more immediate/action intense when you can avoid any 'is being' verbiage. It would be good to add a comma after "directions," as well.
Great sensory descriptor on the aroma of the blood.
Swap "that's" for "This is" the state of humanity. This line of exposition kind of slows the action down, though.
"In the frenzy of this chaotic defence. You gaze at your nearby enemies, there are Krakens dressing with stealthy mechas, both of them are phantom units capable of using their mechanical tentacles built on their suits to strangle unprotected cats until they are nothing more than a juicy pulp of flesh and viscera."
Try, "In the midst of the battle frenzy, you gaze at your nearby enemies. There are two Krakens inside stealthy mechas, phantom units capable of using mechanical tentacles to strangle unprotected cats into a juicy pulp of flesh and viscera."
"damn junction" should probably be "dam junction" if you are intending the sense of a barrier and not the swear word.
"forces survive" -> "forces can survive"
"space station, Each step becomes an agony" -> "space station. Each step is agony"
"were too late" -> "are too late." [Unless this is a flashback. If a flashback, try to introduce it in a way that clues the reader that it is a memory.]
"their helmet and the strange organ Krakens have in their chin release a furious blasting of acid nanoparticle eggs, (an adaptation of what real biological Octopus could do back when animals still existing, they laid 50,000 eggs in one go), are flying around like bullets, burning the skin of anyone who has no mecha suit as yours."
Perhaps try, "...their helmets, the strange organ Krakens have in their chins release a furious blast of acid nanoparticle eggs. They fly around like bullets, burning the skin of all those not wearing mecha suits." [The bit about the Octopus is interesting, but it slows the action down.]
"survived. Only you," -> "survives. Only you do," [again, if this is happening now. If a flashback, then it can be in past tense.]
"days" -> "days."
"Each movement even with the mecha suit extra agility is slow and difficult as..." -> "Even with the mecha suit, movement is slow and difficult, as ..."
"going your team" -> "going. Your team"
"look around but you but nobody..." -> "look around you, but nobody..."
"A single Cougar person over a pile of octopus..." -> "Only you remain. One Cougar person standing over a pile of Octopi." [If Cougar is capitalized in this universe, Octopus/Octopi probably would be as well.]
"long," -> "long."
"Soon another enemy octopus gets closer" -> "Another enemy Octopus gets closer."
"modified on the" -> "modified over the"
"Kraken's design, That is" -> "Kraken's design that is"
"Meanwhile, The feline culture uses sturdier yet lightweight versions trying to maintain decent agility but focused on the close and medium range." Could be something like, "In contrast, the feline culture uses sturdier, yet lightweight, versions that maintain agility while optimizing medium and close range combat." [Meanwhile is generally used for things happening at the same time.]
" Pantera which is a well-balanced model, you have given to it" -> "Pantera, which is a well-balanced model. You have given it"
"rival thrown out your nuke or grenade and use" -> "rival, throw out a nuke or grenade, and use"
Sorry I can't help more. I don't have a lot of extra time to proofread.